character: Dr. Smith
topic: Evolution of Chord Structures
grade: 9
subject: Music
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character: Ms. Johnson
topic: Harmony in Early Music
grade: 9
subject: Music
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character: Mr. Thompson
topic: The Role of Chords in Jazz
grade: 9
subject: Music
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character: Professor Lee
topic: Classical Chord Progressions
grade: 9
subject: Music
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